Piston-cooling system



A. TACCHELLA. PISTON COOLING SYSTEM. APPLICATION FILED NOV. 4, 1915.

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Patented Jan. 25, 1921.

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UNITED STATES PATENT OFFICE.

ADOLF TACCHELLA, OF ST. LOUIS, MISSOURI, ASSIGN OR TO BUSGH-SULZER BROS.- DIESEL ENGINE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MIS- SOURI.

Specification of Letters Patent.

PISTON-COOLING SYSTEM.

Patented Jan. 25, 1921.

To all to [tom it may concern.

Be it known that I, ADoLF TACCHELLA, a citizen of the Republic of Switzerland, residing in the city of St. Louis, in the State of Missouri, have invented the followingdescribed new and useful Improvements in Piston-Cooling Systems.

The invention is an improvement in watercooling systems for the pistons of internal combustion engines, and more particularly in that type wherein the interior of the system is occupied in part by air, gas or vapor, in addition to the cooling liquid. The object of the improvement is to obviate the dripping of the cooling liquid from the sys tem, into the lubricating oil in the crank pit; and in accordance with the invention this is accomplishedby the provision of exhausting means serving to establish a depression of pressure in the system, thereby preventing leakage of water outward through the telescopic or sliding joints which connect the piston with the stationary parts of the apparatus, and providing also the further advantage that oil vapors drawn in from the crank chamber serve to lubricate the said joints.

The means for producing suction in the air spaces of the cooling system may be widely varied. The accompanying drawings show. somewhat schematically, three modes of carrying out the invention. In the said views Figure 1, is a vertical sectional view showing only the reciprocating piston and the stationary parts of the cooling apparatus, the cylinder and other portions of the engine being omitted as unnecessary;

Fig. 2 is a similar view showing another embodiment; and

Fig. 3 is a vertical sectional View showing still another form as embodied in an engine.

In Fig. 1 the cooling chamber 2 of the piston is connected with the water inlet and exit by tube members having sliding joints made approximately tight by packing or stuffing boxes he particular construction of these telescopic parts may be varied, and. as illustrated herein, is constituted by pipes l and 5 which are secured in openings 6 in the chamber 2, and adapted to reciprocate within fixed pipes 7 and 8 rising from the top of a stationary drainage chamher 9. The tubes and also the drain receptacle will be understood to be located at one side of the connecting rod, as indicated in Fig. 3, and the receptacle to be fixed to' the engine casting in any convenient manner. The supply of .water or other cooling liquid to the piston chamber is admitted through a stationary jet pipe 10, which is centrally disposed within the pipe 4, and projects a jet of water upwardly into the piston. entraining with it more or less air,

which enters by way of the annular passage 14, connected by a pipe 15 with the air space in the drainage chamber 9, and creating a slight or partial vacuum therein, which causes inflow rather that outflow through such leaks as may be present in the joints 3. Leakage of water from said joints is thereby effectually prevented and,-as already mentioned.'tl1e lubrication afforded. by the vapors and gases drawn in between the sliding parts, from the oily atmosphere in the crank case maintains the joints running smoothly at all times-,a condition which is difficult otherwise to realize on account of the inaccessibility of the parts. The pump further produces a gradual change of air inside the system which facilitates the cooling.

In order to guard against the drainage chamber becoming flooded, a connection 16 may be provided between the water space therein and the pump, the flow being sub ject to regulation by a valve 17.

The construction of Fig. 9., is similar to that of Fig. 1, except that the water outlet 11 is eliminated, and all of the water which escapes from the system passes outward by way of pipe 18 to the exhaust pump, which thus handles both air and water.

Fig. 3 illustrates a simpler means of oreating the partial. vacuum in the system and eliminating the special pump 14:. In this case the drain chamber 9 is connected by a pipe 19 with the intake manifold 20 of the engine, which is normally, and practically constantly, maintained at less than atmospheric pressure by the inspiration of the engine piston. Otherwise, the system may be the same as already described, the height of the water column in the outflow pipe 11 being predetermined with reference to the vacuum condition to permit gravitational discharge of the water, or other means being provided to remove it.

'hat I claim as new is:

1. In an internal combustion engine, a cooling system comprising a chambered reciprocating piston and means provided with a telescopic joint for introducing and circulating through the piston a mixture of cooling liquid and a gas and means other than the circulating means for producing a partial vacuum insaid system for the purposes set forth.

2. In an internal combustion engine, a piston and means having sliding joints for conducting water to and from the piston with air. and means tor preventing leakage through the sliding joints comprising an engine-driven suction apparatus connected with the air space of the apparatus.

3. In an internal combustion engine. the combination with a reciprocating piston and apparatus for passing ater together with air through said piston. the said apparatus including a. drainage chamber having a sliding joint connection with the pistoln of exhausting means connected with the air space of. said chamber, and a further connection between the said means and the water space of the chamber.

4. The combination in an internal coinbustion engine of the cooling passages thereof, means for passing cooling liquid through the same and a communication between said passages and the suction side of an engine cylinder adapted to maintain a less-thanatmosphere pressure .in said passages to prevent liquid leakage therefrom.

5. In an internal combustion engine. the combination with a cylinder and piston and a conduit connected with the cylinder and wherein suction is produced by the action of the piston. of a cooling apparatus having sliding joint connection wth the piston and constituted to supply the same with water in the presence of air. and a connection between the air space of said apparatus and the said conduit.

(3. The combination in an internal combustion engine of the cooling passages thereof, mea us for passing cooling liquid through the same. a communication between said passages and the suction side of an engine cylinder adapted to maintain a less-thanatmosphere pressure in said passages to prevent liquid leakage therefrom, and means to permitgravitational drainage discharge of the cooling liquid.

In testimony whereof I have signed this specification in the presence of two witnesses.

Witnesses H. Fan-melons. E. E. ADAMs. 

